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-.\" Copyright (c) 2005 Michael Kerrisk
-.\" based on earlier work by faith@cs.unc.edu and
-.\" Mike Battersby <mib@deakin.edu.au>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2
-.\"
-.TH sigpending 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sigpending, rt_sigpending \- examine pending signals
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.P
-.BI "int sigpending(sigset_t *" set );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR sigpending ():
-.nf
- _POSIX_C_SOURCE
-.fi
-.SH DESCRIPTION
-.BR sigpending ()
-returns the set of signals that are pending for delivery to the calling
-thread (i.e., the signals which have been raised while blocked).
-The mask of pending signals is returned in
-.IR set .
-.SH RETURN VALUE
-.BR sigpending ()
-returns 0 on success.
-On failure, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-.I set
-points to memory which is not a valid part of the process address space.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SS C library/kernel differences
-The original Linux system call was named
-.BR sigpending ().
-However, with the addition of real-time signals in Linux 2.2,
-the fixed-size, 32-bit
-.I sigset_t
-argument supported by that system call was no longer fit for purpose.
-Consequently, a new system call,
-.BR rt_sigpending (),
-was added to support an enlarged
-.I sigset_t
-type.
-The new system call takes a second argument,
-.IR "size_t sigsetsize" ,
-which specifies the size in bytes of the signal set in
-.IR set .
-.\" This argument is currently required to be less than or equal to
-.\" .IR sizeof(sigset_t)
-.\" (or the error
-.\" .B EINVAL
-.\" results).
-The glibc
-.BR sigpending ()
-wrapper function hides these details from us, transparently calling
-.BR rt_sigpending ()
-when the kernel provides it.
-.SH NOTES
-See
-.BR sigsetops (3)
-for details on manipulating signal sets.
-.P
-If a signal is both blocked and has a disposition of "ignored", it is
-.I not
-added to the mask of pending signals when generated.
-.P
-The set of signals that is pending for a thread
-is the union of the set of signals that is pending for that thread
-and the set of signals that is pending for the process as a whole; see
-.BR signal (7).
-.P
-A child created via
-.BR fork (2)
-initially has an empty pending signal set;
-the pending signal set is preserved across an
-.BR execve (2).
-.SH BUGS
-Up to and including glibc 2.2.1,
-there is a bug in the wrapper function for
-.BR sigpending ()
-which means that information about pending real-time signals
-is not correctly returned.
-.SH SEE ALSO
-.BR kill (2),
-.BR sigaction (2),
-.BR signal (2),
-.BR sigprocmask (2),
-.BR sigsuspend (2),
-.BR sigsetops (3),
-.BR signal (7)